Writing and research by Rajarshi Chattopadhyay.https://likarajo.github.io/en-ushttps://likarajo.github.io/writing/semantic-guardrails-and-row-level-access/https://likarajo.github.io/writing/semantic-guardrails-and-row-level-access/A practical walkthrough of semantic-layer guardrails, unanswerable-question refusal, and parameterized row-level access using an open-source U.S. EIA electricity agent.Mon, 26 Oct 2026 00:00:00 GMThttps://github.com/likarajo/ai-agent-chatbot/blob/main/docs/article-draft.mdhttps://github.com/likarajo/ai-agent-chatbot/blob/main/docs/article-draft.mdHow a public agent turns a plain-language question into a checked query, and refuses a question the table cannot answer.Thu, 01 Jan 2026 00:00:00 GMThttps://www.linkedin.com/pulse/covid-19-sentiment-analysis-rajarshi-chattopadhyay/https://www.linkedin.com/pulse/covid-19-sentiment-analysis-rajarshi-chattopadhyay/A write-up of a model that classifies the sentiment of COVID-19 tweets.Wed, 01 Jan 2020 00:00:00 GMThttps://likarajo.github.io/writing/big-data-in-agriculture/https://likarajo.github.io/writing/big-data-in-agriculture/How advanced analytics across the food chain, from farm to market to kitchen, can raise farm incomes and cut food waste.Mon, 04 Jun 2018 00:00:00 GMThttps://likarajo.github.io/writing/risc-fpga/https://likarajo.github.io/writing/risc-fpga/A 16-bit RISC design on an FPGA, first runner-up in the IETE Technical Paper Contest.Wed, 01 Jan 2014 00:00:00 GMT